<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>set</title>
</head>
<body>
	<h1>set</h1>
</body>
<script type="text/javascript">
    const ary = [1,25,7,1,9,null,null,25,'a','a','b','c','d','c'];

    const arySet = new Set(ary);

    console.log('arySet',...arySet)
</script>
</html>